Microcontroller User's Manual

27-44 MCF5282 User’s Manual MOTOROLA
Digital Control Subsystem
when the RESUME control bit is set to 0. Situation S7 (Figure 27-29) shows that when
pause operation is not used with queue 2, queue 2 suspension works the same way.
Figure 27-28. CCW Priority Situation 6
.
Figure 27-29. CCW Priority Situation 7
Situations S8 and S9 (Figure 27-30 and Figure 27-31) repeat the same two situations with
the RESUME bit set to a 1. When the RESUME bit is set, following suspension, queue 2
resumes execution with the aborted CCW, not the first CCW, in the queue.
IDLE
Q1:
Q2:
QS
IDLE
IDLE
0000 1000
ACTIVE
C1 C2
T1
Q1:
C1
C3 C4
IDLE
Q2:
PF1
PAUSE
ACTIVE
CF1
T1
ACTIVE
SUSPEND
0100
ACTIVE
ACTIVE
0110 1010
C1 C2 C3 C4
CF2
T2
0010 0000
RESUME = 0
C2
T1
PAUSE
Q1:
Q2:
QS:
IDLE ACTIVE
IDLE
ACTIVE IDLE
0010 0110 1010 0010
ACTIVE
0000
IDLE
Q1:
PF1
C1 C2
0000 1010
ACTIVE
0110
C1
Q2:
T2
C1
PF2
T1
C3 C4
CF1
C3
CF2
SUSPEND PAUSE SUSPEND
T2
C1
C3
C2
ACTIVE
ACT
0101
C4